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Trying to solve bug 1724795.

See also: [1] https://docs.google.com/document/d/138Y1NC7ILDTTj7WkAW77ZV_Z-lxwhApNGJIZZ4OX4yE/edit



OVS supports a bonding mode "balance-slb" ([2]).

[2] http://docs.openvswitch.org/en/latest/topics/bonding/#slb-bondin

This should be supported by kernel's bonding driver.
First, there is a new kernel xmit_hash_policy="vlan+srcmac".
That works with various bonding modes (LACP) that require switch configuration.

The goal is to have that working without switch configuration and `mode=balance-xor`.


Native support for this was rejected by kernel upstream 
https://lore.kernel.org/netdev/?q=add+mac+filter+option+for+balance-xor
but NACK'ed because the filtering can be done with EBPF or NFT.


There is a script to do NFT based filtering (via a NetworkManager-dispatcher script) here ([3]). However, NetworkManager-disatcher does not have the right events (carrier change) for this. Extending NetworkManager-dispatcher might be possible and useful in its own, however, such an "integration" would still be pretty bad.

[3] https://gitlab.com/egarver/virtual-networking

Instead, add native support for this to NetworkManager. Basically, NetworkManager needs to configure some NFT rules when ports to the bond get attached.

branch on review: https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1385

merged upstream: https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/6ef929d19fb7622b4430ecb2434b1562221c65ae

Created attachment 1959533 [details]
Patch for backporting bond.balance-slb feature to rhel-8.6

Btw, there are some WIP upstream patches for backporting the NetworkManager feature to RHEL8, see

 - th/mlag-bonding-slb-1.36
 - th/mlag-bonding-slb-1.38
 - th/mlag-bonding-slb-1.40

See for example https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commits/th/mlag-bonding-slb-1.36

Attached are those patches for rhel-8.6 dist-git (applies on top of commit 64553aa796c0fbc913704bb243418c490bca81d3).

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (NetworkManager bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2485